<template>
  <div class="app-container">

    <!--查询表单-->
    <el-form :inline="true" class="demo-form-inline">
      <el-form-item>
        <el-input v-model="courseQuery.title" placeholder="课程名称"/>
      </el-form-item>

      <el-form-item>
        <el-select v-model="courseQuery.status" clearable placeholder="课程状态">
          <el-option value="Normal" label="已发布"/>
          <el-option value="Draft" label="未发布"/>
        </el-select>
      </el-form-item>

      <el-button type="primary" icon="el-icon-search" @click="getList()">查询</el-button>
      <el-button type="default" @click="resetData()">清空</el-button>
    </el-form>

    <!-- 表格 -->
    <el-table
      :data="list"
      border
      fit
      highlight-current-row>

      <el-table-column
        label="序号"
        width="50"
        align="center">
        <template slot-scope="scope">
          {{ (page - 1) * limit + scope.$index + 1 }}
        </template>
      </el-table-column>

      <el-table-column prop="title" label="课程名称" width="300" />

      <el-table-column label="课程状态" width="80">
        <template slot-scope="scope">
          {{ scope.row.status==='Normal'?'已发布':'未发布' }}
        </template>
      </el-table-column>

      <el-table-column prop="lessonNum" label="课时数" width="65"/>

      <el-table-column prop="gmtCreate" label="添加时间" width="160"/>

      <el-table-column prop="viewCount" label="浏览数量" width="80" />

      <el-table-column label="操作" width="500" align="center">
        <template slot-scope="scope">
          <el-button type="primary" 
          size="mini" 
          icon="el-icon-edit"
          @click="handleEditInfo(scope.row)">
          编辑课程基本信息</el-button>
          
          <el-button 
          type="primary" 
          size="mini" 
          icon="el-icon-edit"
          @click="handleEditChapter(scope.row)"
          >编辑课程章节信息</el-button>

          <el-button 
          type="danger" 
          size="mini" 
          icon="el-icon-delete" 
          @click="removeDataById(scope.row.id)"
          :loading="deleteLoading"
          >删除课程</el-button>
        </template>
      </el-table-column>
    </el-table>

  <!-- 分页 -->
    <el-pagination
      :current-page="page"
      :page-size="limit"
      :total="total"
      style="padding: 30px 0; text-align: center;"
      layout="total, prev, pager, next, jumper"
      @current-change="getList"
    />

  </div>
</template>
<script>
//引入调用teacher.js文件
import course from '@/api/edu/course'

export default {
    data() { //定义变量和初始值
        return {
          list:null,//查询之后接口返回集合
          page:1,//当前页
          limit:10,//每页记录数
          total:0,//总记录数
          courseQuery:{}, //条件封装对象
          deleteLoading: false // 删除按钮加载状态
        }
    },
    created() { 
        //调用
        this.getList() 
    },
    methods:{ 
        //讲师列表的方法
        getList(page=1) {
          this.page = page
            course.getCourseListPage(this.page,this.limit,this. courseQuery)
                .then(response =>{//请求成功
                    //response接口返回的数据
                    this.list = response.data.rows
                    this.total = response.data.total
                    console.log(this.list)
                    console.log(this.total)
                }) 
        },
        resetData() {//清空的方法
            //表单输入项数据清空
            this.courseQuery = {}
            //查询所有数据
            this.getList()
        },
        // 删除课程的方法
        removeDataById(courseId){
          this.$confirm('此操作将永久删除该课程, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
          }).then(() => {
            this.deleteLoading = true
            course.deleteCourse(courseId)
                .then(() => {
                  this.$message({
                    type: 'success',
                    message: '删除成功!'
                  })
                  // 删除成功后刷新列表
                  this.getList()
                })
                .catch(erroe => {
                  this.$message({
                    type: 'error',
                    message: '删除失败!'
                  })
                })
                .finally(() => {
                  this.deleteLoading = false
                })
          }).catch(() => {
            this.$message({
                    type: 'info',
                    message: '已取消删除!'
            })
          })
        },
        // 处理编辑课程基本信息
        handleEditInfo(course) {
          if (course.status === 'Normal') {
            this.$router.push(`/course/updateInfo/${course.id}`)
          } else {
            this.$router.push(`/course/info/${course.id}`)
          }
        },
        // 处理编辑课程章节信息
        handleEditChapter(course) {
          if (course.status === 'Normal') {
            this.$router.push(`/course/updateChapter/${course.id}`)
          } else {
            this.$router.push(`/course/chapter/${course.id}`)
          }
        }
 
    }
}
</script>
